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Reports missing <code>return</code> statements at the end of methods with a non-<b>void</b> return type.
The end of method should be reachable by the method's execution flow.
<p><b>Example:</b></p>
<pre>
<code>
String foo(int a) {
  if (a > 0) {
    return "more than zero"
  }
} // foo(-1) will return 'null'

int bar(int a) {
  if (a > 0) {
    return a
  }
} // bar(-1) will fall with runtime exception
</code>
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